Sinns 256 model resembles other chronograph watches that the company has produced the only difference is that it comes in a smaller case the watch is equipped with valjoux 7750 automatic movement it performs 28 800 vibrations per hour and has 25 bearing jewels the outer bezel of the watch can be rotated in both directions and it marks elapsed time additional features include pressure resistance a day and date window at the 3 oclock mark luminous hands and shock resistant acrylic glass